Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Qstn - Create and share polls and get live results
Facebook Local - Discover places to go and events happening near you
Polls API - Scalable, efficient API to build polls, quizzes, ratings and many more
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Polls.io - Create simple polls in seconds